Another interesting related technology is electromechanical vane display clocks: https://youtu.be/AradTqh0cuM . Each segment is shown (or sometimes obscured) mechanically!
Starts talking about LEDs and totally misses LCDs, which made heavy use of 7-segment displays and were ubiquitous for a few decades in the early years of consumer digital electronics.
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[ 2.9 ms ] story [ 28.1 ms ] threadhttps://www.youtube.com/watch?v=RTB5XhjbgZA&t=18s